He also credited the company's broad portfolio of services for helping offset the impact of the terrorist attacks, which hit the company's air cargo Express service the hardest.

But in its first detailed disclosure of how the attacks have affected its business, FedEx said second-quarter U.S. air express shipments would likely be down 11 percent from a year earlier. International express will fall about 5 percent.

Until now, FedEx had said it was unable to quantify the attacks' effects.